Renewed jump in their step, and future Hall of Famer Jaromir Jagr en route from Dallas, the Bruins Tuesday night banked a pair of first-period goals and used them to scratch out a 3-2 victory over the Senators at TD Garden.

Nathan Horton, slowly recovering his scoring touch in recent days, banged in the winner at 10:21 of the third period, mashing in a rebound of Milan Lucic’s slapper from above the left wing circle.

A huge buzzkill came over the Black and Gold midway through the second period, however, when dependable pivot Patrice Bergeron exited for the night when felled while chasing the puck near his own net.

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Cutting back to aid the defensive effort, the 27-year-old center lost his footing and fell after colliding with Ottawa forward Colin Greening. The replay made it appear that an inadvertent elbow by Greening caught Bergeron on the side of the head, possibly leaving him dazed.

When play stopped, Bergeron straightened up, dropped his stick, reached one hand to the top of his helmet, and skated under his own power directly toward the Boston bench, continuing straight to the dressing room. During the intermission, the club announced that Bergeron, named the top defensive forward in the game last season, was finished for the night. The club provided no immediate word on the nature of his injury.

Bergeron, of course, has a history of concussions, his 2007-08 season cut short at 10 games when he suffered a severe concussion upon being smashed into the rear boards by Philadelphia’s Randy Jones.

He also missed time the following season when nailed in open ice by defenseman Dennis Seidenberg, who then played for the Hurricanes.

Earlier in the day, the Bruins acquired Jagr from the Stars in trade for two prospects and a draft pick.

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He will arrive here Wednesday and likely will play Thursday night vs. New Jersey at the Garden.

After Greening lifted the Senators to a 1-0 lead at 2:48 of the first period, the Bruins responded with their quick-strike pair by David Krejci and Tyler Seguin only 61 seconds apart to take the lead at 4:29.

The clubs combined for an eye-popping 41 shots (22 by Boston) in the first period.

Following a scoreless middle period, Andre Benoit tied it at 2 for the Senators with his goal at 1:55 of the third.

Initially not ruled a goal, Benoit’s attempt was OK’d when replay clearly showed his shot sailed high under the crossbar and then popped out of the net.